an item in which the name or function is unbeknownst to (or has been forgotten by) the person uttering the term
“I twisted the dilly-doo until the thingy lined up with the whosie-whatsit and wouldn’t ya know it. The dingus got all gashnitzed and gashnizzled and the jobby-joo went wizz-bang out the back. Please forgive me if I’m getting too technical for you. It’s just that I’ve been workin’ in the doojigger biz since I was knee-high to a whatchamacallit and I rarely interact with you civilians.”
Hottie at the Club A: oh my god, who's that hot guy sippin that bacardi?
Hottie at the Club B: who, that badass in the corner?
Hottie at the Club A: yea
Hottie at the Club B: oh, yeah he's fucking hot, must be a dibyo
The hour of the night past the witching hour, which begins at 4:00 AM. Most commonly used in Michigan and Chicago to refer to that time of the night when shit gets weird.
"Dude... what the hell was that?"
"I don't know, it's the didly hour, shit gets wierd."